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ipv4: no CHECKSUM_PARTIAL on MSG_MORE corked sockets

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We cannot reliable calculate packet size on MSG_MORE corked sockets
and thus cannot decide if they are going to be fragmented later on,
so better not use CHECKSUM_PARTIAL in the first place.

Cc: Eric Dumazet <[email protected]>
Cc: Vlad Yasevich <[email protected]>
Cc: Benjamin Coddington <[email protected]>
Cc: Tom Herbert <[email protected]>
Signed-off-by: Hannes Frederic Sowa <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Hannes Frederic Sowa 2015-10-27 22:40:39 +01:00 • committed by David S. Miller
commit d749c9cbff
1 changed files with 1 additions and 0 deletions
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1
net/ipv4/ip_output.c
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@ -911,6 +911,7 @@ static int __ip_append_data(struct sock *sk,
if (transhdrlen &&
length + fragheaderlen <= mtu &&
rt->dst.dev->features & NETIF_F_V4_CSUM &&
!(flags & MSG_MORE) &&
!exthdrlen)
csummode = CHECKSUM_PARTIAL;